Group: add new protections for unexpected edge cases

Early return of sDir or sGroupDirName is empty, and check the return value of ini.ReadFile instead of assuming the ini file was successfully read.

src/Group.cpp

@@ -42,6 +42,11 @@ Group::~Group()
 }
 
 Group::Group(const RString& sDir, const RString& sGroupDirName, bool bFromProfile) {
+    if (sDir.empty() || sGroupDirName.empty()) {
+        LOG->Warn("Group::Group: Empty directory or group name provided.");
+        return;
+    }
+
     RString sPackIniPath;
     if (bFromProfile) {
         sPackIniPath = sDir + "/" + INI_FILE;
@@ -72,7 +77,12 @@ Group::Group(const RString& sDir, const RString& sGroupDirName, bool bFromProfil
     
     if (FILEMAN->DoesFileExist(sPackIniPath)) {
         IniFile ini;
-        ini.ReadFile(sPackIniPath);
+        if (!ini.ReadFile(sPackIniPath)) {
+        LOG->Warn(
+            "Group::Group: Failed to read Pack.ini file at '%s': %s",
+            sPackIniPath.c_str(), ini.GetError().c_str());
+            return;
+        }
 
         RString sVersion = "";
         ini.GetValue("Group", "Version", sVersion);